| 摘要 |
A highly discreet and accurate voice pickup device (1106) includes a standard miniature pressure gradient type microphone element provided and mounted very close to the side of the user's head (1100), preferably near the user's ear (1102). The microphone element is oriented so that direction of maximum sensitivity is parallel to the side of the user's head (1100), and points toward the user's mouth so that it will pick up the user's speech sounds (1108 and 1110) as the sounds diffract and travel along the side of the user's face and head, to the microphone element. The microphone element can be configured with low pass networks at front and rear ports (1210 and 1208) of the microphone element, which cooperate with air volume within the microphone to provide additional directional properties that advantageously vary with frequency and further enhance the noise-rejection capability of the microphone element.
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